/*
 * Copyright 2018- The Pixie Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include "src/carnot/planner/objects/var_table.h"
#include "src/carnot/planner/objects/funcobject.h"

namespace px {
namespace carnot {
namespace planner {
namespace compiler {

std::shared_ptr<VarTable> VarTable::Create() {
  // Constructor is hidden so must use raw ptr instantiation.
  return std::shared_ptr<VarTable>(new VarTable());
}

std::shared_ptr<VarTable> VarTable::Create(std::shared_ptr<VarTable> parent_scope) {
  // Constructor is hidden so must use raw ptr instantiation.
  return std::shared_ptr<VarTable>(new VarTable(parent_scope));
}

QLObjectPtr VarTable::Lookup(std::string_view name) {
  if (scope_table_.contains(name)) {
    return scope_table_[name];
  }
  if (parent_scope_ == nullptr) {
    return nullptr;
  }
  return parent_scope_->Lookup(name);
}

bool VarTable::HasVariable(std::string_view name) { return Lookup(name) != nullptr; }

void VarTable::Add(std::string_view name, QLObjectPtr ql_object) { scope_table_[name] = ql_object; }

std::shared_ptr<VarTable> VarTable::CreateChild() { return VarTable::Create(shared_from_this()); }

}  // namespace compiler
}  // namespace planner
}  // namespace carnot
}  // namespace px
